// 重置 标签默认的 margin padding
blockquote,
body,
button,
dd,
dl,
dt,
fieldset,
form,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
input,
legend,
li,
ol,
p,
pre,
td,
textarea,
th,
ul {
    margin: 0;
    padding: 0;
    vertical-align: baseline;
}
* {
    box-sizing: border-box;
}
